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public static SPUser GetUser(this SPListItem item, string displayName)');document.writeln('{');document.writeln('    //get field and cast to User Field type');document.writeln('    var field = item.Fields.GetField(displayName) as SPFieldUser;');document.writeln('');document.writeln('    if (null == field)');document.writeln('    {');document.writeln('        throw new ApplicationException("This field is not a User!");');document.writeln('    }');document.writeln('');document.writeln('    var fieldValue = field.GetFieldValue(item[field.Id].ToString()) as SPFieldUserValue;');document.writeln('');document.writeln('    SPUser user = null;');document.writeln('    if (null != fieldValue) ');document.writeln('    {');document.writeln('        user = fieldValue.User;');document.writeln('    }');document.writeln('');document.writeln('    return user;');document.writeln('}');document.writeln('
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